Vehicle-mounted display system and vehicle

ABSTRACT

The present disclosure provides a vehicle-mounted display system and a vehicle. The vehicle-mounted display system includes a transparent projection screen and a projector configured to project an image onto the transparent projection screen. A first polarizer is attached onto a lens of the projector, and a second polarizer is attached onto the transparent projection screen. The second polarizer has a polarization transmission direction crossing a polarization transmission direction of the first polarizer at such an angle as to enable a light beam from the projector and passing through the first polarizer and the second polarizer to be of an intensity smaller than an intensity of a light beam capable of being recognized by human eyes. The second polarizer has a polarization reflection direction perpendicular to its polarization transmission direction, so as to reflect a light component in the polarization reflection direction.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional application of U.S. patent applicationSer. No. 14/907,787 filed on Jan. 26, 2016, which is the U.S. nationalphase of PCT Application No. PCT/CN2015/084736 filed on Jul. 22, 2015,which claims a priority of the Chinese Utility Mode Application No.201520161621.8 filed on Mar. 20, 2015 and a priority of the ChineseUtility Mode Application No. 201520207405.2 filed on Apr. 8, 2015, thedisclosures of which are incorporated in their entirety by referenceherein.

TECHNICAL FIELD

The present disclosure relates to the field of vehicle-mounted displaytechnology, in particular to a vehicle-mounted display system and avehicle.

BACKGROUND

Recently, some high-end vehicles have been equipped with vehicle-mounteddisplay systems. For the vehicle-mounted display system, usually aprojector is used to project a video image onto a separate projectionscreen or a front windshield of the vehicle, and the projected videoimage may be viewed by a driver when reflected by the projection screenor the front windshield. However, the projection screen or the frontwindshield is generally made of common glass and cannot shield lightbeams completely, i.e., the projected video image may be viewed by aperson outside the vehicle. As a result, it is impossible to ensure theprivacy of the video image, and it is difficult to meet the requirementsof high-end business persons.

SUMMARY

An object of the present disclosure is to provide a vehicle-mounteddisplay system and a vehicle, so as to improve the privacy of theexisting vehicle-mounted display system.

In one aspect, the present disclosure provides a vehicle-mounted displaysystem, including a transparent projection screen and a projectorconfigured to project an image onto the transparent projection screen. Afirst polarizer is attached onto a lens of the projector, and a secondpolarizer is attached onto the transparent projection screen. The secondpolarizer has a polarization transmission direction crossing apolarization transmission direction of the first polarizer at such anangle as to enable a light beam from the projector and passing throughthe first polarizer and the second polarizer to be of an intensitysmaller than an intensity of a light beam capable of being recognized byhuman eyes. The second polarizer has a polarization reflection directionperpendicular to its polarization transmission direction, so as toreflect a light component in the polarization reflection direction.

Alternatively, the polarization transmission direction of the secondpolarizer is perpendicular to the polarization transmission direction ofthe first polarizer.

Alternatively, the polarization transmission direction of the secondpolarizer is parallel to a horizontal plane.

Alternatively, the transparent projection screen is separately arrangedabove a dashboard in front of a driver, and the vehicle-mounted displaysystem further includes a screen bracket connected to the transparentprojection screen, and a screen bracket controller connected to thescreen bracket and configured to control the screen bracket to move thetransparent projection screen to a position above the dashboard in frontof the driver so as to enable the transparent projection screen to bewithin a visual range of the driver, or control the screen bracket towithdraw the transparent projection screen so as to move the transparentprojection screen out of the visual range of the driver.

Alternatively, the vehicle-mounted display system further includes aprojector movement bracket and a projector movement bracket controller,the projector movement bracket is connected to the projector, and theprojector movement bracket controller is connected to the projectormovement bracket and configured to control the projector movementbracket to move the projector to a position in alignment with thetransparent projection screen, or control the projector movement bracketto withdraw the projector.

Alternatively, an identical control assembly is used by the screenbracket controller for controlling the screen bracket and the projectormovement bracket controller for controlling the projector movementbracket.

Alternatively, the transparent projector screen is a portion of a frontwindshield of a vehicle, and the vehicle-mounted display system furtherincludes a projector rotation bracket connected to the projector, and aprojector controller connected to the projector rotation bracket andconfigured to control the projector rotation bracket to adjust an imageprojection direction of the projector.

Alternatively, the vehicle-mounted display system further includes animage correction unit, which includes a gyroscope configured to acquirespace angle information of the projector and arranged on the projector,an imaging plane angle information acquisition module configured toacquire space angle information of the front windshield as an imagingplane, a calculator connected to the imaging plane angle informationacquisition module and configured to calculate a difference between aspace angle of the imaging plane and a space angle of the projector toobtain a correspondence between a point on an image generated by theprojector and a point on an image formed on the imaging plane, and animage corrector connected to the calculator and configured to correctthe image generated by the projector in accordance with thecorrespondence.

Alternatively, the vehicle-mounted display system further includes awheel monitoring camera connected to the projector and configured totake a video image of a vehicle guide wheel and transmit the video imageto the projector.

Alternatively, the vehicle-mounted display system further includes acamera connected to the projector and configured to take a video imageof an ambient environment of the vehicle and transmit the video image tothe projector.

Alternatively, the vehicle-mounted display system further includes atleast two rear-view cameras, a corrector connected to the at least tworear-view cameras and configured to perform distortion correction onvideo images taken by the rear-view cameras in accordance withparameters of the rear-view cameras and a distortion model, an imagegenerator connected to the corrector and configured to performangular-perspective transformation on the corrected video image fromeach camera in accordance with an mounting angle of the camera and aperspective transformation principle to generate a top-view image, and astitching unit connected to the image generator and configured to stitchthe top-view images from the at least two rear-view cameras inaccordance with three-dimensional coordinates of a mounting position ofeach rear-view camera and a vehicle size to obtain a panoramic top-viewimage and transmit the panoramic top-view image to the projector.

Alternatively, the vehicle-mounted display system further includes amotion-sensing identification module configured to identify a user'sgesture or a motion of an eyeball, a memory configured to store thereina correspondence between the user's gesture or the motion of the eyeballand a predetermined instruction, and an interaction controller connectedto the motion-sensing identification module, the memory and theprojector and configured to control the projector in accordance with thecorrespondence between the user's gesture or the motion of the eyeballand the predetermined instruction.

In another aspect, the present disclosure provides in some embodiments avehicle-mounted display system, including a transparent liquid crystaldisplay device. The transparent liquid crystal display device includes atransparent liquid crystal display screen, a transparent light-guideplate arranged at a side of the transparent liquid crystal displayscreen opposite to a viewer in a vehicle, an edge-type light sourcearranged at an light-entering side of the transparent light-guide plate,a first controller configured to control the transparent liquid crystaldisplay screen to display an image, and a second controller configuredto control on and off states of the light source.

Alternatively, the light-guide plate is a directional light-guide plateso as to guide the light beams approximately parallel to each other.

Alternatively, the directional light-guide plate includes a plurality ofguiding mechanisms arranged at a bottom surface of light-guide plate andextending along a light-entering surface of the light-guide plate. Eachguiding mechanism is a groove or ridge of an inverted trapezoidal shape,and has a bottom, an opening section, and a first beveled surface and asecond beveled surface which are connected to the bottom and the openingsection. The bottom of each guiding mechanism is protruded from thebottom surface of the light-guide plate, or a pattern structure isarranged between two adjacent guiding mechanisms and depressed inwardlyin the bottom surface.

Alternatively, the vehicle-mounted display system further includes ascreen bracket connected to the transparent liquid crystal displaydevice, and a screen bracket controller connected to the screen bracketand configured to control the screen bracket to move the transparentliquid crystal display device to a position above a dashboard in frontof a driver so as to enable the transparent liquid crystal displaydevice to be within a visual range of the driver, or control the screenbracket to withdraw the transparent liquid crystal display device so asto move the transparent liquid crystal display device out of the visualrange of the driver.

Alternatively, the vehicle-mounted display system further includes awheel monitoring camera connected to the transparent liquid crystaldisplay device and configured to take a video image of a vehicle guidingwheel and transmit the video image to the projector.

Alternatively, the vehicle-mounted display device further includes acamera connected to the transparent liquid crystal display device andconfigured to take a video image of an ambient environment of thevehicle and transmit the video image to the projector.

Alternatively, the vehicle-mounted display device further includes amotion-sensing identification module configured to identify a user'sgesture or a motion of an eyeball, a memory configured to store thereina correspondence between the user's gesture or the motion of the eyeballand a predetermined instruction, and an interaction controller connectedto the motion-sensing identification module, the memory and thetransparent liquid crystal display device, and configured to control thetransparent liquid crystal display device in accordance with thecorrespondence between the user's gesture or the motion of the eyeballand the predetermined instruction.

In yet another aspect, the present disclosure provides in someembodiments a vehicle including the above-mentioned vehicle-mounteddisplay device.

According to the embodiments of the present disclosure, it is able toprevent the video image displayed by the vehicle-mounted display systemfrom being viewed by a person outside the vehicle, thereby to improvethe privacy of the vehicle-mounted display system.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view showing a vehicle-mounted display systemincluding a projector and a projection screen according to oneembodiment of the present disclosure;

FIG. 2 is another schematic view showing the vehicle-mounted displaysystem including the projector and the projection screen according toone embodiment of the present disclosure;

FIG.3 is yet another schematic view showing the vehicle-mounted displaysystem including the projector and the projection screen according toone embodiment of the present disclosure;

FIG.4 is a schematic view showing the vehicle-mounted display systemincluding rear-view cameras according to one embodiment of the presentdisclosure;

FIG.5 is a schematic view showing the vehicle-mounted display systemincluding a transparent liquid crystal display device according to oneembodiment of the present disclosure; and

FIG.6 is a schematic view showing the vehicle-mounted display systemincluding a transparent liquid crystal display device according to oneembodiment of the present disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The present disclosure will be described hereinafter in conjunction withthe drawings and embodiments. The following embodiments are forillustrative purposes only, but shall not be used to limit the scope ofthe present disclosure.

Unless otherwise defined, any technical or scientific term used hereinshall have the common meaning understood by a person of ordinary skills.Such words as “first” and “second” used in the specification and claimsare merely used to differentiate different components rather than torepresent any order, number or importance. Similarly, such words as“one” or “one of are merely used to represent the existence of at leastone member, rather than to limit the number thereof. Such words as“connect” or “connected to” may include electrical connection, direct orindirect, rather than to be limited to physical or mechanicalconnection. Such words as “on”, “under”, “left” and “right” are merelyused to represent relative position relationship, and when an absoluteposition of the object is changed, the relative position relationshipwill be changed too.

In order to improve the privacy of an existing vehicle-mounted displaysystem, the present disclosure provides in some embodiments avehicle-mounted display system which, referring to FIG. 1, includes atransparent projection screen 21 and a projector 31 configured toproject an image onto the transparent projection screen 21. A firstpolarizer 311 is attached onto a lens 312 of the projector 31, and asecond polarizer 211 is attached onto the transparent projection screen21. The second polarizer 211 has a polarization transmission directioncrossing a polarization transmission direction of the first polarizer311 at such an angle as to enable a light beam from the projector 31 andpassing through the first polarizer 311 and the second polarizer 211 tobe of an intensity smaller than an intensity of a light beam capable ofbeing recognized by human eyes. The second polarizer 211 has apolarization reflection direction perpendicular to its polarizationtransmission direction, so as to reflect a light component in thepolarization reflection direction. In some embodiments, the polarizationtransmission direction of the second polarizer 211 is perpendicular tothe polarization transmission direction of the first polarizer 311, andin some other embodiments, the polarization reflection direction of thesecond polarizer 211 is parallel to the polarization transmissiondirection of the first polarizer 311. The second polarizer 211 may be,e.g., a wire grid polarizer (WGP) or a polarization brightnessenhancement film, so as to allow the transmission of light beamsparallel to its polarization transmission direction and the reflectionof light beams perpendicular to its polarization transmission direction.

A light beam projected by the projector 31 attached with the firstpolarizer 311 is a linearly polarized light beam. When the polarizationtransmission direction of the second polarizer 211 attached to thetransparent projection screen 21 is perpendicular to the polarizationtransmission direction of the first polarizer 311, the linearlypolarized light beam from the projector 31 cannot be transmitted throughthe transparent projection screen 21. At this time, it is impossible fora viewer outside a vehicle to view the video image projected onto thetransparent projection screen 21, thereby it is able to improve theprivacy of the vehicle-mounted display system. Moreover, thepolarization reflection direction of the second polarizer 211 isparallel to the polarization transmission direction of the firstpolarizer 311, so the linearly polarized light beam from the projector31 may be reflected by the second polarizer 211, so as to improvebrightness of the video image displayed on the transparent projectionscreen 21. In addition, an ambient light beam may still be transmittedthrough the transparent projection screen 21 into the vehicle, so thedriver may still view the ambient environments outside the vehicle.

In some embodiments, referring to FIG.2, the polarization transmissiondirection of the second polarizer 211 attached to the transparentprojection screen 21 may also be parallel to a horizontal plane. At thistime, the polarization transmission direction of the first polarizer 311attached onto the lens 312 of the projector 31 is perpendicular to thehorizontal direction. The horizontal plane refers to a planeapproximately parallel to a road surface. Most of the light beamstransmitted into the vehicle (e.g., light beams reflected by the roadsurface or by any other vehicles) are linearly polarized light beamseach with a polarization direction perpendicular to a reflective surfaceof the second polarizer 211, so it is able to prevent the driver frombeing adversely affected by the reflected light beams.

In the above-mentioned embodiments, the transparent projection screen 21may be a separate projection screen arranged above the dashboard infront of a driver's seat or a passenger's seat. The transparentprojection screen 21 may be a transparent glass screen made of commonglass, or glass doped with particles, so as to enhance the reflectiveeffect.

When the projection screen is arranged above the dashboard in front ofthe driver's seat and it is required to display a video image, the videoimage may be projected onto the projection screen. When it isunnecessary to use the projection screen but the projection screen isstill arranged in front of the driver, a viewing field of the driver maybe adversely affected somehow.

In order to solve this problem, in some embodiments of the presentdisclosure, the vehicle-mounted display system may further include ascreen bracket connected to the transparent projection screen, and ascreen bracket controller connected to the screen bracket and configuredto, when it is required to use the transparent projection screen,control the screen bracket to move the transparent projection screen toa position above the dashboard in front of the driver so as to enablethe transparent projection screen to be within a visual range of thedriver, or when it is unnecessary to use the transparent projectionscreen, control the screen bracket to withdraw the transparentprojection screen so as to move the transparent projection screen out ofthe visual range of the driver and prevent the viewing field of thedriver from being shielded.

The structure of the screen bracket is not particularly defined herein.For example, the screen bracket may be a fixed shaft, and the screenbracket controller may include an electric motor connected to the fixedshaft and an electric motor controller. The fixed shaft is configured tofix a bottom of the transparent projection screen and the electric motoris controlled by the electric motor controller so as to drive the fixedshaft to move, thereby to move the transparent projection screen.

In some embodiments, the vehicle-mounted display system may furtherinclude a projector movement bracket and a projector movement bracketcontroller. The projector movement bracket is connected to theprojector, and the projector movement bracket controller is connected tothe projector movement bracket and configured to, when it is required touse the projector, control the projector movement bracket to move theprojector to a position in alignment with the transparent projectionscreen, or when it is unnecessary to use the projector, control theprojector movement bracket to withdraw the projector.

In some embodiments, an identical control assembly may be used by thescreen bracket controller for controlling the screen bracket and theprojector movement bracket controller for controlling the projectormovement bracket, so as to move and withdraw the transparent projectionscreen and the projector simultaneously.

In the embodiments of the present disclosure, apart from being aseparate one, the transparent projection screen 21 may also be a portionof a front windshield of the vehicle. The front windshield may be madeof common glass, or glass doped with particles, so as to enhance thereflective effect.

When the transparent projection screen 21 is a portion of the frontwindshield of the vehicle, the vehicle-mounted display system mayfurther include a projector rotation bracket connected to the projector,and a projector controller connected to the projector rotation bracketand configured to control the projector rotation bracket to adjust animage projection direction of the projector, thereby to enable theprojector to project the video image onto any designated position on thefront windshield.

Through the projector controller, it is able to change a projectiondirection of the video image for the projector in accordance with thepractical need, thereby to improve the user experience. For example,when the driver wants to view the video image, the video image maybeprojected by the projector onto a region in front of the driver, andwhen a passenger in the passenger's seat wants to view the video image,the projector may be rotated so as to project the video image onto aregion in front of the passenger's seat.

When the projector is rotated under the control of the projectorcontroller, the projection direction of the video image is changed, andthe projected video image may be distorted due to the position of theprojector. In order to solve this problem, the vehicle-mounted displaysystem may further include an image correction unit, which includes agyroscope configured to acquire space angle information of the projectorand arranged on the projector, an imaging plane angle informationacquisition module configured to acquire space angle information of thefront windshield as an imaging plane, a calculator connected to theimaging plane angle information acquisition module and configured tocalculate a difference between a space angle of the imaging plane and aspace angle of the projector to obtain a correspondence between a pointon an image generated by the projector and a point on an image formed onthe imaging plane, and an image corrector connected to the calculatorand configured to correct the image generated by the projector inaccordance with the correspondence.

Through the image correction unit, it is able to ensure the user to viewan accurate image on the front windshield, thereby to prevent the videoimage from being distorted due to the position of the projector.

In order to facilitate the human-machine interaction, in the embodimentsof the present disclosure, the vehicle-mounted display system mayfurther include a motion-sensing identification module, e.g., a commoncamera or an infrared camera, configured to identify a user's gesture ora motion of an eyeball, a storage module, e.g., a memory, configured tostore therein a correspondence between the user's gesture or the motionof the eyeball and a predetermined instruction, and an interactioncontroller connected to the motion-sensing identification module, thememory and the projector and configured to control the projector inaccordance with the correspondence between the user's gesture or themotion of the eyeball and the predetermined instruction.

For example, the user may make a gesture of spreading his palm from afisted state, and a predetermined instruction corresponding to thisgesture stored in the memory is “turning on the projector”. At thistime, the interaction controller may send the instruction to theprojector controller so as to turn on the projector.

In addition, the user may also make a gesture of fisting this palm froma spreading state, and a predetermined instruction corresponding to thisgesture stored in the memory is “turning off the projector” (i.e.,stopping displaying the video image on the front windshield). At thistime, the interaction controller may send the instruction to theprojector controller so as to turn off the projector.

In addition, the user may also make a gesture of dragging to the left orright, and a predetermined instruction corresponding to this gesture ofdragging to the right stored in the memory is “rotating the projector soas to move the video image from the front windshield in front of thedriver to the front windshield in front of the passenger's seat”. Atthis time, the interaction controller may send this instruction to theprojector controller, so as to control the projector to rotate and movethe video image from the front windshield in front of the driver to thefront windshield in front of the passenger's seat. A predeterminedinstruction corresponding to the gesture of dragging to the left storedin the memory is “rotating the projector so as to move the video imagefrom the front windshield in front of the passenger's seat to the frontwindshield in front of the driver. At this time, the interactioncontroller may send this instruction to the projector controller, so asto rotate the projector and move the video image from the frontwindshield in front of the passenger's seat to the front windshield infront of the driver.

Of course, the video image projected by the projector may be moved toany other desired positions through the other gestures.

Referring to FIG.3 which shows an alternative embodiment of thevehicle-mounted display system, the vehicle-mounted display systemincludes the projector 31, the projector rotation bracket 32, acontroller, the gyroscope 33, an input module (not shown), themotion-sensing identification module and the memory (not shown). Theprojector 31, the projector rotation bracket 32, the gyroscope 33, theinput module, and the motion-sensing identification module are thosementioned above. The controller includes the above-mentioned projectorcontroller, a computing chip, the image correction unit and theinteraction controller, and it is configured to execute the functions ofthe projector controller, the computing chip, the image correction unitand the interaction controller.

For a traditional vehicle, the ambient information around the vehiclemay be transmitted to the driver through a left rear-view mirror and aright rear-view mirror arranged at both sides of a vehicle body and anintermediate rear-view mirror arranged inside the vehicle, so as toguide the driver. However, there is such a drawback that, when thevehicle is running through a narrow road, the left and right rear-viewmirrors protruding from the vehicle body may be easily scraped.

To overcome this drawback, referring to FIG.4, the vehicle-mounteddisplay system may further include a rear-view camera 10 connected tothe projector and configured to take a video image of an ambientenvironment of the vehicle and transmit the video image to theprojector.

In the embodiments of the present disclosure, the vehicle-mounteddisplay system may include two rear-view cameras 10 arranged at a rearend of the vehicle. Each rear-view camera 10 may be a 360°omnidirectional camera, a rotatable camera, or an ultra-wide anglecamera, so as to acquire the video images of the ambient environments atthe left, right and rear sides of the vehicle. Of course, in some otherembodiments, the number of the rear-view cameras 10 is not limited totwo, and the position of these rear-view cameras 10 is not limited tothe rear end of the vehicle.

According to the vehicle-mounted display system in the embodiments ofthe present disclosure, the existing rear-view mirrors are replaced withthe rear-view cameras for taking the video images of the ambientenvironments of the vehicle, and the video images taken by the rear-viewcameras are projected by the projector onto the transparent projectionscreen. As a result, it is able to prevent the rear-view mirrors frombeing scraped while ensuring the acquisition of the ambient informationaround the vehicle by the driver.

In some embodiments, the vehicle-mounted display device may include atleast two rear-view cameras, a corrector connected to the at least tworear-view cameras and configured to perform distortion correction onvideo images taken by the rear-view cameras in accordance withparameters of the rear-view cameras and a distortion model, an imagegenerator connected to the corrector and configured to performangular-perspective transformation on the corrected video image fromeach camera in accordance with an mounting angle of the camera and aperspective transformation principle to generate a top-view image, and astitching unit connected to the image generator and configured to stitchthe top-view images from the at least two rear-view cameras inaccordance with three-dimensional coordinates of a mounting position ofeach rear-view camera and a vehicle size to obtain a panoramic top-viewimage and transmit the panoramic top-view image to the projector.

The above panoramic top-view image may be used to provide positioninformation of the vehicle relative to a surrounding object to thedriver intuitively, and it is particularly adapted to a parking scene.

In some embodiments, the vehicle-mounted display system may furtherinclude a wheel monitoring camera connected to the projector andconfigured to take a video image of a vehicle guide wheel and transmitthe video image to the projector, so as to enable the driver to acquirea posture of the guide wheel during such a situation as parking, therebyto facilitate the parking.

In the embodiments of the present disclosure, the projector is used incombination with the transparent projection screen so as to display thevideo image. Of course, the video image may also be displayed in anyother modes, e.g., by a transparent liquid crystal display device.However, when the transparent liquid crystal display device is used, itis also impossible to ensure the privacy.

In order to solve this problem, referring to FIG. 5 and FIG. 6, anothervehicle-mounted display system includes a transparent liquid crystaldisplay device 50 arranged above a dashboard in front of the driver'sseat or a passenger's seat. The transparent liquid crystal displaydevice 50 includes a transparent liquid crystal display screen 501, atransparent light-guide plate 502 (e.g., a glass light-guide plate)arranged at a side of the transparent liquid crystal display screen 501opposite to a viewer in a vehicle, an edge-type light source 503arranged at an light-entering side of the transparent light-guide plate502, a first controller configured to control the transparent liquidcrystal display screen 501 to display an image, and a second controllerconfigured to control on and off states of the light source 503.

Through the transparent light-guide plate and the second controller forcontrolling the on and off states of the light source, it is able toswitch the vehicle-mounted display device between a protection displaymode and a common display mode. In FIG. 5, 41 represents a steeringwheel, and 42 represents a pillar A. A surface of the transparentlight-guide plate away from a display panel is provided with a pluralityof mesh-like structures, and the transparent light-guide plate has alight-entering surface connected to a surface of the transparentlight-guide plate away from the display panel and a surface of thetransparent light-guide plate facing the display panel. Each mesh-likestructure is a concave structure formed at the surface of thetransparent light-guide plate away from the display panel, or eachmesh-like structure consists of scattering particles arranged at thesurface of the transparent light-guide plate away from the displaypanel.

To be specific, when the light source is turned on, the light-guideplate may emit light. At this time, a white region may be viewed outsidethe vehicle at a position corresponding to the transparent liquidcrystal display screen, while the desired video image may be viewed by aviewer in the vehicle through the transparent liquid crystal screen, soas to achieve an anti-leakage function. When the light source is turnedoff, the light-guide plate may not emit light. At this time, when theambient light beams outside the vehicle are used as a background, it isable to display the video image on the scenes/road conditions outsidethe vehicle.

In some embodiments, the light-guide plate may be a directionallight-guide plate, so as to guide the light beams approximately parallelto each other. At this time, when the transparent liquid crystal displaydevice is arranged at a region in front of the driver, the passenger inthe passenger's seat may not view the video image displayed by thetransparent liquid crystal display device, and when the transparentliquid crystal display device is arranged at a region in front of thepassenger, the drier may not view the video image. As a result, it isable to prevent the driver and passenger from interfering each other.The directional light-guide plate may, e.g., include a plurality ofguiding mechanisms arranged at a bottom surface of light-guide plate andextending along a light-entering surface of the light-guide plate. Eachguiding mechanism is a groove or ridge of an inverted trapezoidal shape,and has a bottom, an opening section, and a first beveled surface and asecond beveled surface each connected to the bottom and the openingsection. The bottom of each guiding mechanism may be protruded from thebottom surface of the light-guide plate, or a pattern structure may bearranged between two adjacent guiding mechanisms and depressed inwardlyin the bottom surface.

In some embodiments, the vehicle-mounted display system may furtherinclude a screen bracket connected to the transparent liquid crystaldisplay device 50, and a screen bracket controller connected to thescreen bracket and configured to, when it is required to use thetransparent liquid crystal display device 50, control the screen bracketto move the transparent liquid crystal display device to a positionabove a dashboard in front of a driver so as to enable the transparentliquid crystal display device to be within a visual range of the driver,or when it is unnecessary to use the transparent liquid crystal displaydevice 50, control the screen bracket to withdraw the transparent liquidcrystal display device so as to move the transparent liquid crystaldisplay device out of the visual range of the driver, thereby to preventthe viewing field of the driver from being shielded.

The structure of the screen bracket is not particularly defined herein,and for example, it may be a fixed shaft. The screen bracket controllermay include an electric motor connected to the fixed shaft and anelectric motor controller. The fixed shaft is configured to fix a bottomof the transparent liquid crystal display device 50, and the electricmotor is controlled by the electric motor controller so as to drive thefixed shaft to move, thereby to move the transparent liquid crystaldisplay device 50.

In some embodiments, the vehicle-mounted display system may furtherinclude a motion-sensing identification module configured to identify auser's gesture or a motion of an eyeball, a memory configured to storetherein a correspondence between the user's gesture or the motion of theeyeball and a predetermined instruction, and an interaction controllerconnected to the motion-sensing identification module, the memory andthe transparent liquid crystal display device, and control thetransparent liquid crystal display device in accordance with thecorrespondence between the user's gesture or the motion of the eyeballand the predetermined instruction.

For example, the user may make a gesture of spreading his palm from afisted state, and a predetermined instruction corresponding to thisgesture stored in the memory is “turning on the transparent liquidcrystal display device”. At this time, the interaction controller maysend the instruction to the transparent liquid crystal display device soas to turn on the transparent liquid crystal display device.

In addition, the user may also make a gesture of fisting this palm froma spreading state, and a predetermined instruction corresponding to thisgesture stored in the memory is “turning off the transparent liquidcrystal display device”. At this time, the interaction controller maysend the instruction to the transparent liquid crystal display device,so as to turn off the transparent liquid crystal display device.

In addition, in the embodiments of the present disclosure, thevehicle-mounted display system may further include a sliding rail, onwhich the transparent liquid crystal display device is arranged. Theuser may also make a gesture of dragging to the left or right, and apredetermined instruction corresponding to this gesture of dragging tothe right stored in the memory is “sliding the transparent liquidcrystal display device along the sliding rail so as to move thetransparent liquid crystal display device in front of the driver to bein front of the passenger's seat”. At this time, the interactioncontroller may send this instruction to the sliding rail, so as tocontrol the transparent liquid crystal display device to move.

In order to overcome the drawback that the rear-view mirrors of thevehicle are easily scraped, the vehicle-mounted display system mayfurther include two rear-view cameras connected to the projector andconfigured to take a video image of an ambient environment of thevehicle and transmit the video image to the transparent liquid crystaldisplay device.

The rear-view cameras may be arranged at a rear end of the vehicle. Eachrear-view camera may be a 360° omnidirectional camera, a rotatablecamera, or an ultra-wide angle camera, so as to acquire the video imagesof the ambient environments at the left, right and rear sides of thevehicle. Of course, in some other embodiments, the number of therear-view cameras is not limited to two, and the position of theserear-view cameras is not limited to the rear end of the vehicle.

According to the vehicle-mounted display system in the embodiments ofthe present disclosure, the existing rear-view mirrors are replaced withthe rear-view cameras for taking the video images of the ambientenvironments of the vehicle, and the video images taken by the rear-viewcameras are displayed by the transparent liquid crystal display device.As a result, it is able to prevent the rear-view mirrors from beingscraped while ensuring the acquisition of the ambient information aroundthe vehicle by the driver.

In some embodiments, the vehicle-mounted display device may include atleast two rear-view cameras, a corrector connected to the at least tworear-view cameras and configured to perform distortion correction onvideo images taken by the rear-view cameras in accordance withparameters of the rear-view cameras and a distortion model, an imagegenerator connected to the corrector and configured to performangular-perspective transformation on the corrected video image fromeach camera in accordance with an mounting angle of the camera and aperspective transformation principle to generate a top-view image, and astitching unit connected to the image generator and configured to stitchthe top-view images from the at least two rear-view cameras inaccordance with three-dimensional coordinates of a mounting position ofeach rear-view camera and a vehicle size to obtain a panoramic top-viewimage and transmit the panoramic top-view image to the projector.

The above panoramic top-view image may be used to provide positioninformation of the vehicle relative to a surrounding object to thedriver intuitively, and it is particularly adapted to a parking scene.

In some embodiments of the present disclosure, the vehicle-mounteddisplay system may further include a wheel monitoring camera connectedto the projector and configured to take a video image of a vehicle guidewheel and transmit the video image to the projector, so as to enable thedriver to acquire a posture of the guide wheel during such a situationas parking, thereby to facilitate the parking.

The present disclosure further provides in some embodiments a vehicleincluding the above-mentioned vehicle-mounted display system.

The above are merely the preferred embodiments of the presentdisclosure. It should be appreciated that, a person skilled in the artmay make further modifications and improvements without departing fromthe principle of the present disclosure, and these modifications andimprovements shall also fall within the scope of the present disclosure.

What is claimed is:
 1. A vehicle-mounted display system, comprising atransparent liquid crystal display device, wherein the transparentliquid crystal display device comprises: a transparent liquid crystaldisplay screen; a transparent light-guide plate arranged at a side ofthe transparent liquid crystal display screen opposite to a viewer in avehicle; an edge-type light source arranged at an light-entering side ofthe transparent light-guide plate; a first controller configured tocontrol the transparent liquid crystal display screen to display animage; and a second controller configured to control on and off statesof the light source.
 2. The vehicle-mounted display system according toclaim 1, wherein the light-guide plate is a directional light-guideplate so as to guide the light beams approximately parallel to eachother.
 3. The vehicle-mounted display system according to claim 2,wherein the directional light-guide plate comprises a plurality ofguiding mechanisms arranged at a bottom surface of light-guide plate andextending along a light-entering surface of the light-guide plate; eachof the plurality of guiding mechanisms is a groove or ridge of aninverted trapezoidal shape, and has a bottom, an opening section, afirst beveled surface and a second beveled surface, the first beveledsurface and the second beveled surface being connected to the bottom andthe opening section; and the bottom of each guiding mechanism isprotruded from the bottom surface of the light-guide plate, or a patternstructure is arranged between two adjacent guiding mechanisms anddepressed inwardly in the bottom surface.
 4. The vehicle-mounted displaysystem according to claim 2, further comprising: a screen bracketconnected to the transparent liquid crystal display device; and a screenbracket controller connected to the screen bracket and configured tocontrol the screen bracket to move the transparent liquid crystaldisplay device to a position above a dashboard in front of a driver soas to enable the transparent liquid crystal display device to be withina visual range of the driver, or control the screen bracket to withdrawthe transparent liquid crystal display device so as to move thetransparent liquid crystal display device out of the visual range of thedriver.
 5. The vehicle-mounted display system according to claim 1,further comprising: a wheel monitoring camera connected to thetransparent liquid crystal display device and configured to take a videoimage of a vehicle guiding wheel and transmit the video image to theprojector.
 6. The vehicle-mounted display system according to claim 1,further comprising: a camera connected to the transparent liquid crystaldisplay device and configured to take a video image of an ambientenvironment of the vehicle and transmit the video image to theprojector.
 7. The vehicle-mounted display system according to claim 1,further comprising: at least two rear-view cameras; a correctorconnected to the at least two rear-view cameras and configured toperform distortion correction on video images taken by the rear-viewcameras in accordance with parameters of the rear-view cameras and adistortion model; an image generator connected to the corrector andconfigured to perform angular-perspective transformation on thecorrected video image from each camera in accordance with an mountingangle of the camera and a perspective transformation principle togenerate a top-view image; and a stitching unit connected to the imagegenerator and configured to stitch the top-view images from the at leasttwo rear-view cameras in accordance with three-dimensional coordinatesof a mounting position of each rear-view camera and a vehicle size toobtain a panoramic top-view image and transmit the panoramic top-viewimage to the projector.
 8. The vehicle-mounted display system accordingto claim 1, further comprising: a motion-sensing identification moduleconfigured to identify a user's gesture or a motion of an eyeball; amemory configured to store therein a correspondence between the user'sgesture or the motion of the eyeball and a predetermined instruction;and an interaction controller connected to the motion-sensingidentification module, the memory and the transparent liquid crystaldisplay device, and configured to control the transparent liquid crystaldisplay device in accordance with the correspondence between the user'sgesture or the motion of the eyeball and the predetermined instruction.9. The vehicle-mounted display system according to claim 1, wherein thelight-entering side of the transparent light-guide plate is located at aside of the transparent light-guide plate away from the display screen.10. The vehicle-mounted display system according to claim 1, wherein asurface of the transparent light-guide plate away from the displayscreen is provided with a plurality of mesh-like structures, and whereineach of the plurality of mesh-like structures is a concave structureformed at a surface of the transparent light-guide plate away from thedisplay screen, or each of the plurality of mesh-like structurescomprises scattering particles arranged at the surface of thetransparent light-guide plate away from the display screen.
 11. Avehicle, comprising the vehicle-mounted display system according toclaim 1.